Unique Core?

Shirong could not help but let out a pain filled grunt. He felt scared at this as he had sealed his senses and yet this was able to pass through them. The pain in his abdomen seemed to be coming from a foreign source that Shirong felt was a bit familiar.

He wanted to resist, but as soon as he tried that, his hold over the rampaging energy weakened as well. 

~Cough~

Shirong inadvertently coughed out blood as the energy rocked his core again. He was able to hold on with great difficulty and could not even use a healing pill. He felt that losing even a moment's focus could spell doom for him.

He was helpless and could only let the foreign source enter his body. But in a surprise to him, the foreign source looked like a spirit qi construct. The construct entered his dantian but did not harm him, rather it started covering the entirety of his dantian.